Pitch

Hi Friends

I am doing decimation on the voice signal ,after decimation the pitch of the voice has been changed.I suppose ,it shouldn't be changed,

Does anybody has any solution for improvement plz?

[Daniel Shub]

Duplicate of http://www.mathworks.com/matlabcentral/answers/36838-pitch

Answer 1

[Walter Roberson]

This is expected. If you have a waveform that used to play in N seconds, and now you play it in N/2 seconds (supposing here every second sample was removed), then you will have raised the pitch.

If you decimate the samples by a factor of M, then you also have to decimate the samples per second (i.e., frequency) by a factor of M in order to keep the same pitch.

[Daniel Shub]

If you set the sample rate to be 1/M times the original sample rate you should be okay.